package lesson3;

public class Demo_304 {
    public static void main(String[] args) throws InterruptedException {
        Counter304 counter = new Counter304();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.count);
    }
}

class Counter304{
    public  int count = 0;
    private Object locker = new Object();
    public  void increase(){
        synchronized(locker){    // 所当前对象
            count++;
        }
    }
}
